Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32b1148s&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM32B-1148
Physics
2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
On September 3 (day 247), 2000, ˜0408-0417 UT, a pulsed geomagnetic signature was observed at the low-latitude dayside ground stations. The magnetic field strength at geosynchronous orbit also showed this single pulse variation. Using solar wind observations, we confirmed that the pulsed geomagnetic field was due to the change in the solar wind dynamic pressure, which indicates that the external source is in the form of the single pulse signature. Unlike the dayside feature at low-latitudes, mid- and high-latitude ground stations on the nightside(local time ˜4-5 hours) recorded latitude-independent geomagnetic perturbations with a period longer than 700 s during about three cycles. These perturbations simultaneously occurred with the pulse at the dayside low-latitude stations. This indicates that the dayside and nightside geomagnetic perturbations are excited by a common source, but that their generation mechanisms may be different. In this study, we discuss the generation mechanism of the latitude-independent pulsations observed at the mid- and high-latitudes on the nightside. In addition, we observed transient transverse perturbations by the POLAR spacecraft in the nightside magnetosphere while the magnetosphere was driven by the external pulse. This may be attributed to the transient response of the field lines to externally applied pressure disturbance.
Kim Kyounghee
Lee Daehee
Sung Sangkyung
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